CLN: Remove `n_io_process`

[aresnow1]

What do these changes do?

The code about n_io_process will be moved into Xorbits in https://github.com/xprobe-inc/xorbits/pull/401, remove code in Xoscar.

Related issue number

Fixes #20

Check code requirements

• [ ] tests added / passed (if needed)
• [ ] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #21 (173189e) into main (6c56257) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   90.98%   91.30%   +0.32%     
==========================================
  Files          42       42              
  Lines        3205     3187      -18     
  Branches      641      638       -3     
==========================================
- Hits         2916     2910       -6     
+ Misses        215      204      -11     
+ Partials       74       73       -1     

Flag	Coverage Δ
unittests	91.15% <100.00%> (+0.32%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
python/xoscar/backends/indigen/backend.py	100.00% <ø> (+30.76%)	:arrow_up:
python/xoscar/backends/test/backend.py	100.00% <100.00%> (ø)

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